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Thursday, April 12, 2012

Kitchen salt is a good fixer

Under request of a skeptic I undertook a test called the Sulphide Test on a piece of film fixed with salt. I prepared a solution of sodium sulphide (the substance that stinks in Carnival bombs) and I putted a drop of this thing on the piece of film during 5 minutes. If some silver were in it (not completely fixed), I would get a brown stain. Nothing happened, salt passed the test! One may use kitchen salt as a cheap fixer and combining concentration and temperature it is possible to fix in less than 2 hours. But why not leaving it at room temperature over night?

Before the test

During the 5 minutes test

After the test no brown stain, no silver at all.

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